Hi Antoine, et al. Your reply is very helpful, so I think you got the right question :-)
1) Good point that I can use callback on every uicontrol. This would be suitable for a simple example (like gui_example.sce) ... but for heavy calculations, it might be more practical with a CALC button. P.S. The correct equation for the resonance frequency is fres=sqrt(k/m)/(2*%pi);
2) I see what you mean, so not having an empty space, but "show" the whole she-bang from the beginning. I didn't want to do that (just deleting the IF-statement), but it could be the best solution in the end (rather than the inline GUI updates), if nothing better shows up. This was somehow the "core" of my question. Maybe I ask for too much.
3) I will look into this. Thanks for the tip.4) I will also look into this. My problem is the steep learning curve. If you look at the Scilab tutorials you have the good-old Openeering LHY_Tutorial - it's incredibly complicated and long. Is LHY_Tutorial using the Model-Viewer-Controller approach? - Maybe the Model-Viewer-Controller could be presented in a _simple_ tutorial - is it possible?
I appreciate gui_example.sce with just about 70 lines of code, two inputs and one output. I think something like it could help a lot of people ... and it's not 250 lines of code to get a GUI up and running, if you know what I mean. The gui_example shows a few differences, like white versus grey background, editable boxes, etc. In the outputs, because of the default grey background, you can see the dimensions of the grid / text-boxes, and gui_example has two buttons. It looks operational and easy to expand for new users.
Cheers, Claus On 28.11.2019 08:57, Antoine Monmayrant wrote:
Hello Claus, I've been playing a bit with GUIs for teaching, so maybe I can help. The issue is that I don't get what your problem is exactly here, so I my answer might be a bit off-topic. Do not hesitate to rephrase your issue, I'll try a more focused answer. Anywya, here is how I think your code could be improved: (1) You can use 'calc' as the callback for all of the editable text field so that your result gets shown right away, without having to press a button. (2) You should populate all the uicontrols of your gui first, then only update the displayed values, the visibility of the uicontrols, etc inside your calc function. (ie no more creating a uicontrol inside a callback) (3) The 'tag' property of any uicontrol together with 'findobj()' are really nice to get/set the properties of each existing uicontrol. (4) You can rely on a proper Model-View-Controler approach (or any other well established method to avoid mixing gui stuff with calculation stuff). I attached a small gui I use to illustrate optical anti-reflection coating. It is far from perfect (I did not implement a proper model-view-controler for example). But you can see how I tried to separate the different parts of the code an how I use findobj/tag/get/set, etc. Hope it helps, AntoineLe Mercredi, Novembre 27, 2019 19:21 CET, Claus Futtrup <cfutt...@gmail.com> a écrit:Hi there I'm trying to build a GUI. For simplicity on the forum, I've built a really simple example of what I'm trying to do. How can I make the "conditional" GUI output work and not have it inside the calc function? ... or, how would you do it? Thanks. Best regards, Claus. // GUI_EXAMPLE.SCE // // Demo of how to build a simple GUI in Scilab. // Real simple, with two input variables and one output. // The example uses the basic mechanical example of a mass and a spring as // input parameters and calculates the resonance frequency of the mechanical // system. // Initialize variables m = 1; // Moving mass 'm'(kilogram) k = 1; // Stiffness, spring constant 'k'(Newton per meter) fres = 1; // Resonance frequency (Hertz) show_result = %f; function calc() m = evstr(get(ge_m,"string")); // get content in uicontrol ge_m k = evstr(get(ge_k,"string")); // get content in uicontrol ge_k fres = sqrt(m * k); // putting GUI updates inside the calculation routine is not pretty code. uicontrol("style","text","string","Result :","position", .. [10 as(2)-110 80 20]); uicontrol("style","text","string",string(fres), .. "position",[100 as(2)-110 80 20]); uicontrol("style","text","string","Hz ","position", .. [200 as(2)-110 30 20]); show_result = %t; // update global variables [m,k,fres,show_result]=return(m,k,fres,show_result); endfunction function goodbye() close(ge); // Close GUI window printf("Resulting fres: %f Hertz\n",fres); abort // Print result in console (e.g. for copy/paste), then kill the app endfunction ge = scf(); // GUI Example, Initialize and 'set current figure' as = ge.axes_size; // read size of window, as = [width height] ge.figure_name = "GUI Example"; // Change window header uicontrol("style","text","string","Moving mass :","position", .. [10 as(2)-35 80 20],"background",[1 1 1]); // white background // position properties has four parameters = x,y,width,height // y-position counts from lower left corner, so we subtract from 'as' ge_m = uicontrol("style","edit","string",string(m), .. "position",[100 as(2)-35 80 20]); uicontrol("style","text","string","kg ","position", .. [200 as(2)-35 30 20],"background",[1 1 1]); uicontrol("style","text","string","Stiffness :","position", .. [10 as(2)-60 80 20],"background",[1 1 1]); ge_k = uicontrol("style","edit","string",string(k), .. "position",[100 as(2)-60 80 20]); uicontrol("style","text","string","N/m ","position", .. [200 as(2)-60 30 20],"background",[1 1 1]); uicontrol("style","pushbutton","string","Calculate", .. "position",[10 as(2)-85 80 20],"callback","calc"); // How do I make this "conditional"output show up in my GUI? if show_result then // If "Calculate"button was pushed at least once ... uicontrol("style","text","string","Result :","position", .. [10 as(2)-110 80 20]); uicontrol("style","text","string",string(fres), .. "position",[100 as(2)-110 80 20]); uicontrol("style","text","string","Hz ","position", .. [200 as(2)-110 30 20]); end uicontrol("style","pushbutton","string","Exit", .. "position",[10 as(2)-135 80 20],"callback","goodbye"); _______________________________________________ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
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